Window decorations: glass pane no longer overlaps the FlatLaf window title bar (issue #630)

CHANGELOG.md

@@ -5,8 +5,11 @@ FlatLaf Change Log
 
 #### Fixed bugs
 
-- FlatLaf window decorations on Linux: Fixed broken window resizing on
+- FlatLaf window decorations:
-  multi-screen setups. (issue #632)
+  - Fixed inconsistent size of glass pane depending on whether FlatLaf window
+    decorations are used (e.g. Windows 10/11) or not (e.g. macOS). Now the glass
+    pane no longer overlaps the FlatLaf window title bar. (issue #630)
+  - Linux: Fixed broken window resizing on multi-screen setups. (issue #632)
 - IntelliJ Themes:
   - Fixed default button hover background in "Solarized Light" theme. (issue
     #628)

flatlaf-core/src/main/java/com/formdev/flatlaf/FlatClientProperties.java

@@ -442,6 +442,17 @@ public interface FlatClientProperties
 	 */
 	String TITLE_BAR_FOREGROUND = "JRootPane.titleBarForeground";
 
+	/**
+	 * Specifies whether the glass pane should have full height and overlap the title bar,
+	 * if FlatLaf window decorations are enabled. Default is {@code false}.
+	 * <p>
+	 * <strong>Component</strong> {@link javax.swing.JRootPane}<br>
+	 * <strong>Value type</strong> {@link java.lang.Boolean}
+	 *
+	 * @since 3.1
+	 */
+	String GLASS_PANE_FULL_HEIGHT = "JRootPane.glassPaneFullHeight";
+
 	//---- JScrollBar / JScrollPane -------------------------------------------
 
 	/**

flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatRootPaneUI.java

@@ -362,6 +362,10 @@ public class FlatRootPaneUI
 				if( titlePane != null )
 					titlePane.titleBarColorsChanged();
 				break;
+
+			case FlatClientProperties.GLASS_PANE_FULL_HEIGHT:
+				rootPane.revalidate();
+				break;
 		}
 	}
 
@@ -442,11 +446,11 @@ public class FlatRootPaneUI
 			int width = rootPane.getWidth() - insets.left - insets.right;
 			int height = rootPane.getHeight() - insets.top - insets.bottom;
 
+			// layered pane
 			if( rootPane.getLayeredPane() != null )
 				rootPane.getLayeredPane().setBounds( x, y, width, height );
-			if( rootPane.getGlassPane() != null )
-				rootPane.getGlassPane().setBounds( x, y, width, height );
 
+			// title pane
 			int nextY = 0;
 			if( titlePane != null ) {
 				int prefHeight = !isFullScreen ? titlePane.getPreferredSize().height : 0;
@@ -454,6 +458,15 @@ public class FlatRootPaneUI
 				nextY += prefHeight;
 			}
 
+			// glass pane
+			if( rootPane.getGlassPane() != null ) {
+				boolean fullHeight = FlatClientProperties.clientPropertyBoolean(
+					rootPane, FlatClientProperties.GLASS_PANE_FULL_HEIGHT, false );
+				int offset = fullHeight ? 0 : nextY;
+				rootPane.getGlassPane().setBounds( x, y + offset, width, height - offset );
+			}
+
+			// menu bar
 			JMenuBar menuBar = rootPane.getJMenuBar();
 			if( menuBar != null && menuBar.isVisible() ) {
 				boolean embedded = !isFullScreen && titlePane != null && titlePane.isMenuBarEmbedded();
@@ -467,10 +480,12 @@ public class FlatRootPaneUI
 				}
 			}
 
+			// content pane
 			Container contentPane = rootPane.getContentPane();
 			if( contentPane != null )
 				contentPane.setBounds( 0, nextY, width, Math.max( height - nextY, 0 ) );
 
+			// title pane
 			if( titlePane != null )
 				titlePane.menuBarLayouted();
 		}

flatlaf-extras/src/main/java/com/formdev/flatlaf/extras/FlatInspector.java

@@ -108,6 +108,7 @@ public class FlatInspector
 	private Window window;
 
 	private boolean enabled;
+	private Object oldGlassPaneFullHeight;
 	private Component lastComponent;
 	private int lastX;
 	private int lastY;
@@ -258,6 +259,14 @@ public class FlatInspector
 
 		this.enabled = enabled;
 
+		// make sure that glass pane has full height if enabled
+		if( enabled ) {
+			oldGlassPaneFullHeight = rootPane.getClientProperty( FlatClientProperties.GLASS_PANE_FULL_HEIGHT );
+			rootPane.putClientProperty( FlatClientProperties.GLASS_PANE_FULL_HEIGHT, true );
+			rootPane.validate();
+		} else
+			rootPane.putClientProperty( FlatClientProperties.GLASS_PANE_FULL_HEIGHT, oldGlassPaneFullHeight );
+
 		// make sure that glass pane is not opaque, which is not the case in WebLaF
 		((JComponent)rootPane.getGlassPane()).setOpaque( false );